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Question

A man standing at a distance of 6m from a building 21.3 m high observes a kid slipping from the top floor. With what speed should he run to catch the kid at a height of 2 m from the ground? (Assume speed of the person to be uniform; g=10ms−2

A
1ms1
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B
2ms1
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C
1.5ms1
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D
3ms1
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Solution

The correct option is D 3ms1
The kid will fall (21.3 - 2) =19.3m
Now, h=(1/2)gt2 From here we get t = 2 sec (close to)
If u = speed of the man, then u x 2 = 6
Or u = 3 m/s

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